Things haven't always been so smooth between skiers and snowboarders. While most popular ski resorts usually allow both groups to play on their hills, three U.S. ski areas — Deer Valley, Alta, and Mad River Glen — have banned snowboarders outright, and other mountains are full of moguls, a type of terrain snowboarders hate. That said, acceptance for the sport has certainly improved since it debuted in 1965, and the number of resorts welcoming fans with specially made terrain has increased over the years.
